Raytheon STD 21 GPS Operation Manual page 44

Figure 31: Antenna Unit, recommended mounting angles
The mounting angles (trim and course) have to be adjusted at the Operator Unit.
An estimated trim angle and a course angle (compared to pier--course or other heading
reference) must be set up in the Operator Unit.
Deviation from the ship's centerline and/or the baseline (within the tolerances) have to
be adjusted, see section 3.5.5.
3717/110--850.DOC020002
Baseline
Satellite Compass
STD 21 GPS
Antenna Unit
6°
6°
36
6° 6°
Mast
Edition: Feb. 05, 2007